I ask because my normal recreational ride is 10 to 20 miles. I doesn't seem worthwhile to bring my bike, if the trails are a mile or two of shorefront with dog walkers and dense pedestrians.
https://www.strava.com/heatmap
I sometimes do open water swim workouts in the Foster City lagoon and then get on my bike and ride over Crystal Springs Rd to CaƱada Rd. If you go all the way to the south end of the reservoir and turn around at Pulgas Water Temple it's about 25 miles round trip, but you can cut it shorter.